Answer: because you think a letter was easiest way to represent the elements. Another way is to use the chemical symbols and it is to allow you to write chemical formulas easily.
Explanation:
Hm maybe put the definition of each choice? AHH sorry
<span>Animals with a monogastric digestive system are able to digest and use a high percentage of the fats and proteins that they take in from their foods and therefore exhibit high levels of energy.</span>
This occurs in dihybrid crosses
There is a 9/16 chance of the offspring have all dominant traits
A 3/16 chance of the offsprings traits being dom/rec or rec/dom
A 1/16 chance of the traits being all recessive.
For example if Tall is dominant to short and Red is dominant to green
9/16ths of the offspring will be Tall and Red
3/16ths will be either Tall and green OR short and Red
1/16ths chance the offspring will be short and green
Gametes are sex cells. They are sperm and egg.